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Related Experiment Videos

Hemodynamics in the prone jackknife position during surgery.

T Hatada1, M Kusunoki, T Sakiyama

  • 1Second Department of Surgery, Hyogo College of Medicine, Japan.

American Journal of Surgery
|July 1, 1991
PubMed
Summary

Prone jackknife positioning in colorectal surgery caused temporary decreases in cardiac index (CI). However, head-down rotation normalized CI, with manageable heart rate and blood pressure changes, indicating safety.

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Area of Science:

  • Anesthesiology
  • Surgical Physiology
  • Cardiovascular Monitoring

Background:

  • Prone jackknife positioning is utilized in specific colorectal surgeries.
  • Hemodynamic effects of this position require careful evaluation for patient safety.

Purpose of the Study:

  • To investigate the hemodynamic alterations during prone jackknife positioning in patients undergoing colorectal surgery.
  • To assess the cardiovascular response to supine, prone, and jackknife positions.

Main Methods:

  • Hemodynamic parameters were monitored in 19 patients using arterial and Swan-Ganz catheters.
  • Measurements were taken in supine, prone, and jackknife positions, including during head-down rotation and Lloyd-Davies position transitions.

Main Results:

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  • A significant decrease in cardiac index (CI) was observed upon transitioning to the prone position.
  • Head-down rotation following prone positioning led to an increase in CI, returning it to supine levels (p < 0.05).
  • Heart rate (HR) decreased, and mean arterial pressure (MAP) increased in the prone jackknife position.

Conclusions:

  • The observed hemodynamic changes during prone jackknife positioning in colorectal surgery are generally not problematic.
  • The cardiovascular system demonstrates adaptability, with normalization of cardiac function after head-down rotation.